Mounting for sheaves and the like



April 5, 1950 w. SIEGERIST 2,505,215

MOUNTING FOR SHEAVES AND THE LIKE Filed April 30, 1945 2 sheets-sheet 174 /A/l EA/7'ORI wwuvsw g wwm i 14/5 0 -r TOR/V5145.

April 25, 1950 w. SIEGERIST 2,505,215

' MOUNTING FOR SHEAVES AND THE LIKE Filed April 30, 1945 -2 Sheets-Sheet2 Patented Apr. 25 1950.

UNITED PATENT, OFFICE MOUNTINGFOR SHEAV'ES AND THE LIKE WalterSiegerist, University City, Mo. Application April 30, 1945, Serial No.590,978 2 claims. "(CL ash-52.06)

1. this invention relates to. the mountin of sheaves, ears, sprocketwheels and other-rotary power transmission members; on; their shafts. Acommon mounting means for such rotary trans; miss on members includes alongitudinally split bushing havinga tapered seat to fit; within: the

tapered. bore of th transmissionmemberaand hav n a p ripheral flangeadjacent to the lar e end. oi said seat, and screws passin through saidmember and said flange, parallel to. the shaft axis; whereby said membermay? be: drawn tighten the ape d sea po ion of the bushingand'the'bu-sh, iii-g; itself contraotedagainst the shaft. In some of"such mountings, the transmission member has extra longitudinal screwholes therein through which the; locking; screw are threaded and broughtinto endwise engagement with the polriphe-ratfiange of the bushing todismount said member from. the tapered seat portion of said bushins:

With; such; mountings, when the hub: length of the transmission memberis: equal to; or greater for the bushing eor-responds to the face'widthof said" member. Suchimountings are also unsuit able for use; with smalldiameter transmission members, becausetheperipheral flange of thebushing is of larger diameter than the 'transm'issionmember and is thusliable to interfere with the operation thereof.

The-principal objects of thepresent invention are to provide a simpleand corn-pact" strong and durable, easilymountable and demount'ablemountingof the above'ty'pe' that will dispense-with the flange on thebushing and thus obviate the above noted difiiculties, that will providefor increasing thelocking'action upon relative rotary movement of thetransmission member'and' bushing, and that willhave other'advanta'gesherein aft pp a in The invention consists. principaliy in providing the,gansmission member with radiallv disposed. SGIEfiWs that are! adaptedto bear against beveled surfaces; onthe: bushihg toi cause relativeendwi'se iiqv'ement oi v the member and bushingjto tighten said; memberon: thetaperedt seat oi the bushing :{ggd to release it. therefrom. Theinvention furtherconsists in the'mounting fon'thetransmission memberand'in theparts andcombinations and .refer to like parts wherever theyoccur,

Fig; 1 is an end elevational view of a sheave provided with a, mountingembodying my inven: tion,

Fig. 2 is a central longitudinal section on the line Z.-..2 inFig; 1,

Fig. 3. is av central. longitudinal section on the iin'e 311% in. Fig.2, showing the use of the screws to remove-the sheave from, the bushing,

Fig. 4 is an. end elevational view showing a modified form of theinvention,

Fig. 5 is a. similar view showing another medi-s fic ation of theinvention,

Fig. 6: is a central longitudinal sectional view showing another form ofthe invention,

Fig. 7 is a view similar to Fig. 6 showing another modification of theinvention,

Fig. 8. is an end'elevational View showing another modified form of theinvention,

, Fig. 9 is a; central longitudinal section on the line B -.-.-9 in Fig.8,

Fig. 10 is a central longitudinal section on the line [ill-l 0 in Fig.93,. showing the screws mounted in the unlocking holes of the sheave,

Figs. 1-1 and 12 are central longitudinal sec tional views illustratinganother form of the in- BHUQ I; and.

Figs. 13 and 14 are central longitudinal sec tional views illustrating afurther modification of the nvention.

In Figs l, 2; and 3; my invention is shown embodied in a. sheavemounting comprising a shaft I, a bushing Z- mounted on said shaft and asheave 3' mounted on said bushing. The bushing 2 is splitlongitudinally, as at 4, from end to end along one side thereof and hasa tapered outer peripheral surface or seat 5 extendin from end to endthereof. The hub 6 01;- the sheave or other rotarypower'transmissionmember 3 has a ta.- pered axial bore 1 fitting, on the tapered seat 5 ofthe bushing 2-, said hub and bushing being of substantially the samelength.

An annular groove 8 with inwardly converging side walls 9 andlll-is'formed in the tapered seat portion 5 thereof concentric therewithnear the large; end thereof. The corresponding end portion of the hub 6of the sheave 3 or other power transmission member has one or more screwthreaded looking" holes I! extending radially throughsaidhub. In theconstruction illustrated; thehub ii of the sheave 3 is shown providedwith two-axially alined diametrically opposed locking holes H; adaptedtoreceive hollow or socket-head setscrews l2; withcone'point' ends l3.Theloclh ing or mounting screw holes I l are located so thattheup'ointed" ends l3 of thescrews l2 therein are the tapered bore-I inthe hub 6 of the sheav 3;

the side wall 9 being the one located farthest from the large end ofsaid bushing. As shown in Fig. 3, the hub 6 of the sheave 3 also has asecond set or pair of axially alined diametrically opposed unlocking or'dismounting holes I4 that are the same size as the locking holes II, butare offset therefrom circumferentially of the hub and longitudinallythereof in the direction of its large end so that the screws I2 areadapted, when threaded into the unlocking holes with the hub seatedtightly on the bushing, to bear radially against the other inclined orbeveled side wall or annular shoulder III of the annular groove 8 in thebushing 2.

In assembling the above sheave mounting, the split bushing 2 is mountedon the shaft I and the hub B of the sheave 3 is fitted on the taperedseat 5 of said bushing. In this position of the parts, the set screws I2are mounted in the locking holes II of the hub 6 of the sheave 3 andbear endwise against the inclined side wall 9 of the annular groove 8 inthe tapered seat portion 5 of the bushing 2. With the parts thuspositioned, tightening of the screws I2 in the looking or mounting holesII causes the pointed ends I3v of said screws to bear against theinclined side wall 9 of the annular groove 8 and thus causes relativeendwise movement of the bushing 2 and hub 6 in a direction which willdraw the hub tight on the tapered seat portion 5 of the bushing andcontract the latter so as to tightly grip the shaft I. Thus, the sheave3, bushing 2 and shaft I are rigidly locked together by the friction ofthe tapered surfaces and the holding power of the screw I2. Indisassembling the sheave mounting, the screws I2 are removed from thelocking holes II in the hub 6 and threaded into the unlocking holes I 4thereof which are in position to cause the pointed end-s I3 of thescrews I2 to engage the other oppositely inclined side wall III of theannular groove 8 and cause relative endwise movement of the bushing andsheave in a direction which will break the tight fit of the splittapered bushing 2 in the hub of the sheave and release the grip of saidbus-hing on the shaft I The construction illustrated in Fig. 4 issimilar to that shown in Figs. 1, 2 and 3, except that the annular screwreceiving groove 8a in the bushing 2 is disposed slightly eccentricthereto. With this arrangement, if the screws I2 are not fully advancedin the locking holes II, any slight rotation of the sheave 3 relative tothe bushing due to the driving power causing such movement causes thepointed end I3 of one of the two diametrically opposed locking screws I2to move deeper into the eccentric annular groove 80., thereby firmlylocking the complete sheave and hub assembly. This arrangement alsopermits the operator to rock the hub and sheave assembly as a unit backand forth on the shaft while slipping the assembly in place. Thiseccentric groove arrangement is preferable for use with large diameterpower transmission members. The mounting bushing for. said large sizepower transmission members may also be secured to the shaft I by meansof a torque transmitting key I5. However, the driving key may bedispensed with in the case of smaller sheaves, gears and the like. I

As shown in Fig. 5, a construction equivalent to the eccentric grooveconstruction may be provided by means of a straight V-shaped groove 8bformed in the tapered seat 5 of the bushing 2 crosswise of the axisthereof, relative rotary movement of the sheave and bushing causing theannular groove 8, the screw in the other hole is in position to engagethe side wall 9 and cause a hub and bushing.

In the construction shown in Fig. '7, the tapered mounting bushing 2terminates at its large end in a tapered or conical end face 9a and atthe opposite end in a, tapered or conical end face Illa. The hub portion6 of the sheave 3 has one or more radial screw-threaded locking holesIIb therein adjacent to the large end of the tapered bore thereof; andthese holes are located so that the pointed ends I3 of the screws I2therein will bear against the inclined or beveled surface 9a at thelarge end of the bushing and thus cause relative endwise movement of thebushing and hub in a direction that will seat the hub tightly on thetapered seat 5 of the bushing and cause the latter to firmly grip theshaft I. The hub 2 is also provided adjacent to the small end of theaxial bore thereof with one or more unlocking holes I la. In the lockedposition of the parts, the unlocking holes Ma are positioned so that thescrews I2 when threaded therein will engage the tapered end IIIa of thebushing 2 and break the tight fit between the hub and bushing andrelease the latter from the shaft.

In the construction shown in Figs. 8, 9 and 10, the bushing 2 isprovided near the large end thereof with one or more inwardly taperingconical holes and the hub 6 of the sheave 3 is provided with one or moreradial screw threaded locking holes 0 and one or more similar unlockingholes I 4b. The two sets of holes are offset longitudinally of the hub Bat such distance that the screws I2, when threaded into the lockingholes I I0, will bear against one side of the conical holes 80 in thebushing and b nd the latter in the bore of the hub, while said screws,when threaded through the unlocking holes I Ib, will bear against theopposite sides of said conical holes and break the tight fit of the hubon the tapered seat of the bushing. This construction is particularlyadapted for use in constructions where n the bushing is thin and acontinuous annular groove therein would tend to reduce the strengththereof.

In the construction shown in Figs. 11 and 12, the hub 6 hasscrew-threaded radial locking and unlocking holes Nd and I40 offsetlongitudinally of said hub; and the bushing 2 has locking holes 8dlocated opposite the locking holes II it in the hub 6 and has unlockingholes 8e located opposite the unlocking holes Me in said hub. The holes8d and Be in the bushing 2 are disposed at reverse oblique angles to theaxis thereof, whereby the screws I2, when engaged with the locking holesI Id in the hub, are adapted to bear against one side of the inclinedlocking holes 801 of the bushing and thus clamp the parts together, andsaid screws, when engaged with the unlocking holes I40 in said hub areadapted to bear against the opposite sides of the oppositely inclinedunlocking holes Se in said bushing and thus release said parts. I

In the modification shown in Figs. 13 and 14, the power transmissionmember is shown in the form of a solid, hubless multiple groove sheave3a and the locking holes lle are located in the bottom of the beltgroove at the large end of the tapered bore in said sheave, while theunlocking holes I 4d are located in the bottom of the next adjacent beltgroove. The mounting bushing is provided near its large end with twoaxially spaced V-shaped annular grooves 8d. The spacing of the grooves8d is such that, when the tapered bore of the sheave seats on thetapered seat of the bushing, the locking holes He will be locatedopposite one of the annular grooves 8d and the unlocking holes 14d willbe located opposite the other of said annular grooves. Thus, when thescrews l2 are inserted in the locking holes I Ie the pointed ends of thescrews will bear against one side wall of a groove 8d and tightly drawthe sheave and bushing together, while said screws, when tightened inthe unlocking holes Md will engage the other side wall of the othergroove 8d and force the sheave and bushing apart end- Wise.

My invention has a number of practical advantages. It provides easilyaccessible radially disposed screws for causing relative endwisemovement of the power transmitting member and the bushing to lock andunlock the mounting; it dispenses with the need for the outstandingcircumferential flange on the end of the bushing; it reduces theover-all length of the mounting; it enables the mounting to be appliedto shafts wherein the space available for the bushing is substantiallythe same as the face width of the transmission member; and it gives themounting a symmetrical external appearance. It also permits the bushingand sheave or other transmission member to be handled, shipped andapplied to and removed from the shaft as a loosely pre-assembled unit.

Obviously, numerous changes may be made without departing from theinvention and I do not wish to be limited to the precise constructionshown and described.

What I claim is:

1. A sheave or like mounting comprising a sheave or the like having atapered axial bore and a bushing having a tapered seat fitting withinsaid bore, said bushing having a recess therein with two opposed beveledfaces spaced apart longitudinally of said bushing and disposed atreverse oblique angles to the axis thereof, and a member mounted in saidsheave and movable crosswise of the axis thereof into selectiveengagement with each of said beveled faces to thereby eifect relativeendwise movement of said sheave and bushing in one direction to drawsaid sheave tight on said tapered seat of said bushing and in the otherdirection to break the tight fit of said sheave and bushing, said recesscomprising an external annular groove formed in said bushing eccentricto the longitudinal axis thereof and having side walls that convergetoward the bottom of said eccentric annular groove and form :7 the twobeveled faces of said bushing.

2. A sheave or like mounting comprising a sheave or the like having atapered axial bore, a bushing having a tapered seat fitting within saidbore, said bushing having an external annular groove formed thereineccentric to the longitudinal axis thereof whose side walls convergetoward the bottom thereof, and a member mounted on said sheave andextending into the tapered axial bore thereof for selective engagementwith either one of said converging side walls of said eccentric groove,whereby rotary movement of said sheave relative'to said bushing withsaid member in engagement with one of said converging side Walls of saideccentric groove will cause relative axial movement of said sheave andbushing in one direction to draw said sheave tight on said tapered seaton said bushing and rotary movement of said sheave relative to saidbushing with said member in engagement with the other of said convergingside walls of said eccentric groove will cause relative axial movementof said sheave and bushing in the opposite direction to break the tightfit of said sheave and bushing.

WALTER SIEGERIST.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,191,313 Johnston July 18, 19161,661,226 Martin Mar. 6, 1928 2.098.709 Murden et a1. Nov. 9, 1937

